docs: record Ob.temp git history slimming

Ariver

2026-09-01 c773fcdd1f73ca6526e11bb672b8fe33e0339a77

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{
    "schemaVersion": 2,
    "targetPeriod": "2026-07",
    "updatedAt": "2026-07-15T13:14:56.838Z",
    "dates": {}
}